Street sweeper



Aug. 24, 1943. A. L. FARRAR STREET SWEEPER 'i Sheets-Sheet 1 Filed May 14, 194s www wm www mw mw ma QS www.

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@ /A/VE/WUR: 622 ALV/Af J fil/PRA@ Aug. 24, 1943. A, L. FARRAR STREET SWEEPER Filed May 14, 1940 '7 Sheets-Sheet 4 STREET SWEEPER Aug. 24, 1943.

7 Sheets-Sheet 5 Filed May 14, 1940 /N VEA/roe 1 TTORNEVS.

Aug. 24, 1943.

A. L. FARRAR STREET SWEEPER Filed May 14, 1'940 7 Sheets-Sheet 6 :5w mi l .A Armen/Ens.

Patented Aug. 24, 1943 STREET swnnrna.

Alvin J. Farrar, Cleveland, Ollio,` assignor to The` Van Dorn Iron Works Company, Cleveland, Ohima corporation of Ohio Application May 14, 1940, `Serial No. 335,110

comms.

The invention relates to `street sweepers, and particularly to machines of thischaracter having a chassis of the automobile typeincluding a pair of front driven supporting. wheels and a central rear supporting and steering wheel. An engine of standard automobile design, with transmission and differentiahdrives a power shaft from which are driven the front wheels, a rear transverse rotary main broom, an elevator adapted to receive dirt from the main broom, a front curbbroom rotatable Vupon a vertical axisand adapted to throw out dirt from the gutterinto the pathway of the rear mainbroomfand a water pump which with suitable pipe.L connections provides a spray transversely of ther roadway and adjacent the front of the machine.

The principal improvements in the machine relate to a new arrangement of driving elements for actuating the several driven functioning members; an improved symmetrical arrangement of the several driven elements laterally and longitudinally relative to the chassis; improved means providing automatic longitudinal and lateral pivotal adjustments of; the curb-broom whereby the latter can conform without undue strain to unevenness of the roadway adjacent the curb and irregularities of the curb; improved means for vertically lifting and lowering themain ltransverse broom, the curb-broom, and the elevator; andan improved elevator and supporting structure therefor, including means for longitudinally adjusting the elevator pulleys relatively to each other to maintain tight the dirt-conveying belt transversing said pulleys.

Other detailed improvements in the machineY l will fully appear inthe following' description by reference to the accompanying drawings.

The claims of this application are limited to the improvements in curb-broom attachments.

The annexed drawings andthe following description set forth in detail certain mechanisms illustrating the improvements, such illustrations, however, being only a few of the various structural forms in which the principle of the invention may be. embodied.

In said annexed drawings:`

Figure l'is a plan-'view of the improved street sweeper, the top cover being partly broken away;

Figure 2 is an elevation of the curb side of the machine, an automatically adjusted position of the curb-broom being also indicated by broken lines;

Figure 3 is a 'fragmentary vertical longitudinal Figure 6 is-a vertical longitudinal section, taken in the place 'indicated by. the line 6 6, Figure 1, certain parts of the machine being shown in elevation;

Figure 7 is a View ofthe lower right hand end of the machine, as shown in Figure 6*the view particularly disclosing' a `bottom dump door for the dirt reservoir in open position, whereas this dump door is shown in Figure 6 in closed position;

Figure -is a fragmentary, elevation of the front of the machine, partially broken away, and particularly showing the use of fabric dirt-receiving bags in the dirt hopper; Y

Figure 9 is a vertical transverse section, taken in the planes indicated by the lineil-B, Figure 6;

Figure 10 is a longitudinal plan section, taken in the planes indicated by the line lil-I 0, Figures 2 and 6;

Figure 11 is atransverse section through the dirt elevator and its housing, taken in the plane indicated by the line l l'-lvl, Figures 2 and 6;

` Figure 12 is a fragmentary top plan, upon an enlarged scale, partly broken away,` and with some parts in section, and particularlyshowing the arrangement of the various drive mechanisms actuated from the main power shaft;

Figure 13 is a side elevation, particularly showing the'drive for the waterpump, the View being taken from the plane indicated by the line 13,-! 3, FigurelZi,l

Figure 14 is a fragmentary `vertical longitudinal section, upon an enlarged scale, showing theourbbroom and its shaft, and the driveand mounting for the shaft, anautomatically `adjusted position rof the curb-broom and' some related elements being shown in broken lines; y

Figuresl, 16, 17, and 18 are longitudinal plan sections taken, respectively, in the planes indicated by the lines lIt-l5, itl-lli, l'l-Il, and l8--I8,Figur e 14.; and A.

Figure 19 is a transverse vertical section, taken in the plane indicated by the linel lll-I 9, Figures 14and15.

Referring to the annexed `drawings in which the same parts are indicated rby the same respective numbers in the severalviews, the improved street sweeper includes an engine I having hood l, with a transmission 3, dilferential 1i, and main section, taken in the plane indicated by the line 3-3, Figurel, ofthe upper part of the elevator, the iigure particularly disclosing one of a pair of adjustable conveying-belt tightening devices; Figures 4 and 5 are transverse sections, taken in the respective planes indicated bythe lines ,fi-4, and 5 5, Figures 2 and 6;

power shaftf 5, all of standard construction and operating in a manner well `known in automobile operation. A'. suitable chassis including main frame channels |50 and other related frame structure, some of which will be hereinafter referred to in detail, supports the aforementioned elements-upon a pair 'of iront `driven supporting wheels I2 and a central rear supporting and steeringlwheel ',I3.\ The machine is driven and operated from a drivers seat-2, a gear'shift lever 3", steeringzwheel lll-,brake pedal lll, and clutch Pedal |12.' being Drei/ide@ Y 1 The machine has a main of'itside casing provided with a forward rearwardly-opening cover |33 hinged at |34 and forming a hood over a dirt receivinghopper |25. Y

A main cross frame channel 225, Figures 1 and 6, assists in strengthening and in tying together the two sides of the chassis, and forms an importhe operator and designed particularly for controlling the operation of the improvedfunctioning elements of the".sweeper, [asl distinguished from the more or less standard propulsive ele# ,menta will be hereinafter referred to and dei v y scribed in detail.

tant support for various parts of the machine andhas fastened to it a strap 22| for securing they post of the steering wheel I4.

The rear steering wheel I3 is mounted in a depending forked'hanger 203, Figure 2, which depends from and is rotatably mounted at its upper end in transverse angles 220, Figure 1, secured to the main frame member |95, the steeringarm 15' being fixed to thenhanger 12H3 and being actuated by agstandard assemblage oflinkage l5 frorn'the steering wheel i4. Lampsffor the machinev are indicated by 85, transverse straps forsteadying awater tank |3-'|'y by- |44, and a tank-filling opening'byflfi.

Attention will now be directed `in a general manner to `certain frame elements which serve to supportand strengthen lthe several parts of `the-improved sweep'er in Ya manner hereinafter rnore'specicallyreferredto when said parts and gussets 281 the rear ends of the angles |91 are secured to the bottom'ends of vertical 4angles 205,-Figures 2 and 14, which angles 2.05`are'secured by gussets 2|4, Figure 2, to one end of angles (|95. The latter are extended diagonally across the top of the machine undertheupper elevator vpulleyll and laterally of the upper end of theelevator 32, the other end of the angles 95 beingsecured .by gussets y21B -to onek end of rearwardly and' downwardly extending angles 2|9.

The latter are secured at their other ends to gussets 224 yin turn Ysecured to the top ends of vertical angles .222 whoseflower ends Iare secured bygussets `228 to the -main frame channels |90. Angles ,223, are also extended rearwardly-.from the gussets 224 and form supports for a shaft |89 upon which the brake pedal ITI is pivoted. The intermediate parts of the vertical angles 295 are secured by gussets 204 to the main frame `channels |9ll and to the dirt reservoir |25. Y l' Thegussets 224. Figure 4.2, Aare secured ,tothe elevator housing 31 and also to the rearwends of horizontal longitudinal angles 2|5 whose .front ends :are secured to the gussets 2M and which kalsoare secured to andreinforce the housing 37. Also secured to the gussets 2M are horizontal longitudinalangles |86, Figure 6, which with a front transverse angle 81 reinforces `the side walls -IBB of thedirt hopper |25. Also secured to thegussets '2|8, Figure 2, are the vforward ends of .horizontal angles 2|l whose rear ends are secured tothe tops of'vertical angles 216 to whose lower ends the rear ends of angles 223 are secured andinwhich the 'brake pedal shaft Y|89 is mounted. The ends of the tank-steadying straps |54 are adjustably secured to the angles2l'l. y

Hand levers and pedalidevices, and their lre- Briefly, the structure and assembly of the various parts of the improved sweeper contemplate 'that a drive lfor an lelevating dirt conveyor shall function with a drive for a curb-broom 65, upon one side, the curb side of the machine, and that a drive for a rear main transverse broom 3|, together with a drive for a water pump |35, shall function upon the other side of the machine. The vdrive for the pair offrent lmain supporting wheels 'i2 functions, asis usual, upon both sides 'of the machine; in other words, the main power shaft' 5 acts through sprockets andchains directly upon both of the main'wheelsglZg'as hereinafter described.V Y

-Furthermore the structure Vand assembly of theseveral 4machine parts contemplate that the putting into operation ofthe elevator 32, vthev main broo1n'3 l; the curb-broom65, andlthe -water pump |35, shall-be effected from a single actuating member, afootpedal |50, and that the-de tailed structural arrangement of the velements controlling such operation Ashall besuch that, upon the proper actuation of the fcot'pedal 450,

the elevator 32A and the curb-broom-65 shall 'be connected for operation lslightly off vthe commencement of operation lof the main broom'3-l and Vtlfrewater pump |35; specifically, as assembled, the main broom 3 |v and the water pump`f|35 are put into operation slightlyahead of the elevatore? and curbbroom (i5. The structure and vassembly of the elements further contemplate devices for lifting "andlowering the main broom 3|, theelevator 32, and the curb-broom 55 as a unit by theactuationjof aihand-lever T0;

4,Other features of the machine contemplate automatic `transverse and longitudinal adjust- 'n'rentsof the curb-broom 65 to accommodate 4irreeulanitiesv in the curband the. roadwayfa'djaf cent'the'curb, respectively; also, 'thecontrol from a hand lever m5 of `thedumpinjg of gathered dirt from the dirt hopper |25 through a bottom dump door ||1.

Y The improved sweeper also contemplates'a plu-y .A

rality r of methods of removingI thegatheredldirt dumped into the dirt hopper |.25 `from the ele` vato'rv discharge plane 54. In addition to 4the dumping of the gathered diruthrough #nepottom door H7, it may be discharged from the top ofthe elevator 32 into suitable boxes |30, Figures 1 and 6, positioned in the dirt reservoir |25 upon opposite sides ofa dust shed |542, Figure 1, which boxes |30 may be removed-.through side vopening front doors |3| Figuressand 8; or, if temporary storage for the gathered-dirt-outside of the-:machine, is desired, it may be ,discharged from the elevator 32 intov fabric bags |59, Figure 8, `positionedin the-dirt reservoir |25, and the filled bags removed 'through the doors |3I and `parked for convenient later removal or for conveyanceof the same to a suitable discharge area therefor.r

-Inlother wordsgthe use" of the boxes |38, preferably of metal or other 'solid' structure, kcontemplates immediate dumping of the same as they are lled; whereas, the use of the fabric receptacles |59 contemplates the loading of the same inte a truck when filled, or the leaving of the same at the curb for later picking up, for conspectively associated elements, under control of veyance to and emptying thereof in a suitable dirt-receiving area.

Referring in sequence to the detailed structure of the various machine parts designed to cooperate and function in the manner hereinbefore generally described, and first referring to the driving of the pair of main front supporting wheels I2, this is accomplished in a standard manner by means of a pair of sprockets l0, Figure 12, secured adjacently interiorly of the main frame member |95 to the power shaft 5, over which sprockets Ii] play a pair of drive chains which also respectively engage a pair of sprockets |51' secured to stub shafts I5 to which the main wheels I2 are also respectively secured.

Referring now to the drives for the functioning elements of the improved sweeper:

Elevator drive Another sprocket 50, Figures 1, 2, and l2, is

ersing a lower pulley 51 secured to a cross shaft l 41. The belt conveyor 45 is a composite rubberfabric structure and is provided with a plurality of spaced transverse lifting angular rubber blades 46 secured to the exposed faces of the belt conveyor 45 on its upper and lower runs.

Curb-broom drive Also secured to the pulley shaft i3 upon the curb side of the machine is a sprocket 55 over which .plays a chain 56 which also engages a n sprocket 51 secured to a transverse shaft 58 mounted at one end upon tapered roller bearings |2| in a swiveling frame member |93, from which shaft 58, by detailed structure hereinafter fully described, a vertical shaft 54, to which the curbbroom |55 is secured, is rotated., Hence, it will be understood that the elevator 32 and the curbbroom 65 are both driven from the curb side of the machine and are controlled concurrently. ,l

Main. broom and water pump drives Also, concurrently controlled with the elevator 32 and curb-broom 65, but driven from the opposite side of the machine, Figures 12and 13, are the main broom 3| and the water pump |35. Although the main broom 3| `and water pump |35 are controlled concurrently withthe elevator 32 and the curb-broom 55, they are not put into operation simultaneously therewith, but actually go into operation slightly ahead of the elevator 32 and the curb-broom 55, due to the structure and cooperative relation of certain elements hereinafter fully described. i

The driving of themain broom 3| and the water pump V|35 is effected through a sprocket 2l] secured to the power shaft 5 on the far side of the machine, Figures 1 and 12. A chain 2| plays over said sprocket 25, and also over a sprocket 22 secured to a shaft 23 and a sprocket |4| secured to a shaft |55, Figure 13. Secured to the shaft 23 is a spur gear 2d, Figure 12, engaging a spur gear 25 securedto a transverse shaft 26. Secured to the shaft 25 is a sprocket 21 over which plays 'a longitudinal chain 28 which is a drive for the main broom 3|, inasmuch as the chain 28 also plays over a sprocket 29- secured to a shaft 30 running transversely across the rear of the machine and to which the main broom 3| is secured.

' The shaft |40 is the shaft which lactuates the pump |35, the arrangement being that this pump feeds water from the water tank |31, the pump receiving the water through the inlet |35, Figure 13, and discharging it through pipeV |33, Figure 1, by which itis conveyed to a transverse front spray pipe |39 secured tothe under surfaceof the front bumper |93.

Drrue'controlv for the brooms, cle'udtor,v

and water pump The elements by which the drive chains for the two brooms, the elevator, and the water pump are operatively connected to or disconnected from' the power shaft 5, and by means of which the main broom and water pump are put into operationl slightly ahead of the elevator sand curb-broom, are controlled by the foot pedal |50 and are as follows: l

The exterior faces of the hub membersA of the sprockets 40 and 2U, Figures l and 12, are clutch formations |62 and |58 and lie in opposed rela-` tion to respectively cooperating exterior clutch formations IBI and |51, the power shaft 5 intersecting all these clutch formations. The hubs upon which the clutch formations |62 and |68 are formed are rotatably mounted upon the power shaft 5,'and the hubs of the clutch formations |6| and `|51 are splined to the power shaft 5.

When it is desired to actuate the sprockets lil and 2E! and, hence, the drive chains 5| and 2|, the respectively cooperating clutch parts 4are brought into vengaged position. This is effected as follows:

The pedal |55 is pivotally mounted intermediate its ends upon a pin |55', Figure 12, and pivotally secured to and adjacent the bottom end of the pedal is the rear end of'a link |55 to whose` forward end is pivoted the end of an 'angular arm |55 pivoted intermediate its ends upon a vertical pin |51 mounted in a bracket |55 supported by a bracket member 255 upwardlyextended from the main frame member |90. The forward end of the arm |54 beyond the pin |51 is a yoke formation with `members |54 and |5f|2 straddling the powershaft 5 adjacentthe hub member having the clutch face formation ||5|.l Extended into a peripheral groove of said hub member are pins |56 secured to the yoke members |54 and I5!!2 so that movement inwardor outward of the arm |54 will engage or disengage the clutch faces l5! and |52, and the hub member with the clutch face |52 canrctate with the power shaft 5 with the groove of the hub member of the clutchface ill! passing the pins |55. The upper 'member i5i2'cf the yoke, Figure 2, is pivotally secured by a pin |52 .to a bolt |53 having a head or nut |53 to which one end of an arm |58 is'welded, the other end of the arm |58 being secured `to a` freely transversely movable shifter-shaft |5| running across the machine somewhat to the rear of the power shaft 5. The shifter-shaft |5| is housed in a transverse rotatable tube having collars engaging members |63 in which it is journaled, the members |63 being secured to the inner face of the main frame |50, so that the tube |50 is transversely fixed.

, The far end of the shifter-shaft |5|, Figure 12, is of yoke formation and is fastened by a pin I5 to Vupstanding angular end portions |55 'of an,

ait-ni '6,5 which is. riveted intermediate its enos noon.. o vertical nin. lill mounted in a bracket! 59 secured to an upstanding bracket member 2110 mounted upon the main frame memberY lsu. fllliefreereno oi the son loi is also of yoke forma- 'GloIL Similar to the forward end of the 'armlil on. the euro side. and has pins tot' which oet upon, and have a similar ,relationv to, the `clutch face |61, as the pins I6@ on the curb side have with relation to the clutchface |6I.

The clutch member |61 on the far Iside of the machine is engaged with the clutch member |63 slightly in 'advance of the engagement-, of the clutch member IBI on the curb side with the clutch member |62 because the member |61 is actuated by the shifter-.shaft til which, beine actuated by the loin |52, moves laterally twice as fast as` the member l 6| which is actuated by the pins |68. Therefore, when the pedal |50 is actuated to bring the respective clutch parts into engagement, the operations of the main broom 3| and the Water pump |35 commence slightly in advance of the operations of the elevator $2 and the curbebroom d5, obviating the throwing n of all these loads simultaneously.

y Curb-broom assembly n The shaft 64 for the curb-,broom 65 is rotatably mounted upon bearings llliand H9, Figure lll, in a sleeve 66 vertically slideable in a housing 8,1 upon the faces of inwardly-extended bosses 912 with which the housing 51 is formed. The front end of the curb-.broom assembly is supported upon a bracket |26 secured to the main frame member |30. |fhel feront of the frame member |80 is connected by gussets 208 and 2&8 and vertical angle Zlll, Figure 2, to the underlying horizontal angle IBI. The bracket |26 has spaced semicylindr-ical lower bearing portions 226, Figures 15 and 1Q, cooperating with upper semiecylindrical bear-ing caps 22,6 whereby housing Vliberliber ||l3 for the shaft 58 is pivotally mounted upon said shaft and thus provides means, in a manner and through elements hereinafter lfully described, whereby the curbfbroom 65 can automatically adjust itself longitudinally of the roadway in order to conform to irregularities in the roadway adjacent the curb. The curb side of the shaft 5,8 is closed by a cover 221 securedto the member IGS by'means of the iiange 2j23 and said shaft .58; is mounted upon one set of tapered roller bearings 2| in the cover 2.21 and upon a second set ol'v ytapered roller bearings I2! ,in the' pivotal housing iot- .Secured to the curb side end of the shaft 5.8 Figures 14, 15 and 19, is a beveled gear. 59 which meshes with a beveled gear 50 secured to one end of a shaft 6| to the other ond of which is secured a second beveled gear 6l. meshing with a beveled gear 63 splined to the curb-broom shaft Gil. As stated, tapered roller bearings |2| are provided for the shaft 5B carrying the gear 5,9 and similar bearings |22 and |29 are provided, respectively, for the hubs of the gears. 6.o. and ind for an elongated hub of vthe gear 5,3. curb-broom shaft Sli entends upwardly through and beyond the elongated hub of the gear 63 and is housed in a cover member 91'. A cover member 99 upon which the housing member 91 is mounted accommodates the exterior parts of the bearings |29 and the upper end of the elongated hub of the gear 53 is locked against the upper face of the upper bearing |29 by lockfnuts |23,- Br this and. other means hereinafter fully describedg provision is, mafie for lifting the oorbsecured to and within the hub |24 of an annular broom bracket plate H12 superposed upon and bolted to a circular plate (not shown) secured in the body of the curb-broom 65.

The upper end of the curb-broom shaft housing $1 is formed with an enlarged portion 9.3 ex; tended toward the shaft 53 and providing a chamber for thegears 6?, and 63 and the shaft Sl, the bearings l2? having engagement with, this housing portion 9,3. "'Ihe housing portion 93 is secured to the pivotal housing member |Q3 by a split annular plate i @D which is bolted to a flange tot of theswive'ling member tot and is seated in a peripheral groove in the housing'member' 93. The outer surface of the member 93 can slide upon the inner surface of the member lll?! and can slide ori the side surfaces of the plate ZQ, and its Curb end suriaeeunon the :lange .223 of the cover member 22.1; hence. 'the curb-broom shaft asseinblv can move upon, the axis of the shaft tl inwardly and o.utvvardlyv of the curb- Tliis aetion takes place automatically .according to the irregularities of Curb surface. encountered by the Curb-broom G5- Ai peripheral packing ring |21 is seated in the housingr ymember 9 3 against the inner surface of the swivelivng member I 03. The rear open end of the housing member 93, is closed by a cove;` plate |0| upon which'are formed brackets |00 supporting at their rear ends a pin 89* which will be hereinafter more fully referred to.

The automatic pivotal swinging of the whole curb-broom assembly about the shaft 58, longitudinally of the curb., is occasioned, as before mentioned. by irregularities .in vthe roadway aoj cent the curb. Thus, the curb-broom 6K5.,y by

having automatic adjustments in two relatively right angular planes, passes over roadway irregularities and conforms to curb irregularities without undue strain. However, the curb-broom 65 vtends closely to hugthe curb by reason of the pressure of a spring plate 61 fastened at one end to the mainframe memberlil and bearingv adjacent its other en d against a boss 9,13 formed v on the housing 91 of the curb-broom shaft B4.

Lifting and lowering of the brooms and elevator By means hereinafter fully described, the curbbroom 65, in common with the elevator 3-2 and the main broom 3|, can be vertically lifted sov as to be carried by the machine clear of the ground when the machine is simply traveling and it is not desired to gather dirt. Insofar as the curbbroom 65 is concerned, these lifting means consist ofA an elongated tie-rod 8B, Figure 14, actuated as hereinafter described, by the hand lever 1|), the forward end of which tie-rod 88 is secured to a clevis I pivotally secured to one part of a rock arm 8S pivoted upon the pin 89 and the 4 one end of an arm 92.

other part of which rock arm 89is pvotally secured to a clevis 90 secured to afrod9| secured to a` clevis ISI, Figure 17, pivotally secured to The other-end of the arm 92 is secured to a pin 92' supported in arms 914 formed on the housing 91 and is splinedto the hubs 94 of opposed arms 94 straddling the housing 91 of the curb-broom shaft 64 and having enlarged end portions 942 formed with elongated slots 99 intersected by a pair of inwardly-extending opposed pins 95 seated in the curb-broom shaft sleeve 66. The pins 95 pass through vertically-elongated slots 93 in the housing 9|. It is evident, therefore, that a rearward pull upon the tie-rod 88 will lift the forward end of the arm 92 and hence the arms 94 which will effect the lifting of the curb-broom shaft sleeve 69 and hence the curb-broom shaft 94 and the curb-room 65, the sleeve 66 sliding upwardly in the housing 9'I over `the surfaces of the bosses 912, the elongated slots 98 in the housing 9'I permitting the upward movement of the pins 95, and the elongated slots 96 permitting the necessary rearward movement of the arms 94.

The actuation of the hand lever 'l0 is eifected over the face of a toothed segment 12, Figure 2, the `teeth of which segment are engaged by a spring-actuated dogk il whose disengagement is effected through the medium of aretractile rod having a nger-actuated upper end portion 1|. An angular lower end portion 'iii' of the hand lever 'I9 is secured to a shaft 80 mounted in a hanger S2 depending fromthe main frame mem.- ber |99, and to this lower end portion 'I9' of the hand lever'l is pivoted the rear end of the tie-rod 89 The actuation of the hand lever 'I0 to lifi-I the curb-broom 65 also serves to lift the rear main broom 3| and the elevator 32 by means which will now be described. n

Mounted upon hub members 81 at. theV ends of the main broom shaft 39 are extensions 18 which are bolted to the lower ends of downwardly and rearwardly extending channels 'F5 whose upa per ends are secured to hub members E9 pivoted upon avtrunnion 'Il mounted in a hanger 84 depending from the main frame member |99. Around the channels 'I5 and intermediate their ends and adjacently above the main broom 3| are secured bolts .79 having eyes "i9 to which are secured one end of chains 'Irl whose other ends are secured to one end of leversS whose other ends are secured to the shaft 39. Also secured to the'under surface of the broom-lifting channels 'I5 and adjacent the lower ends thereof are one end of chains 83 `whose other ends are secured to the elevator 32. Therefore, it is evident, the actuation of the hand lever "ill to lift the curb-broom 95 -will also effect the lifting of the main broom 3l and the elevator 32.

Elevator The elevator 32 -is enclosed by` an Vopen-ended housing 31, Figures 2, 4, 5, 10, and ll, secured bythe main framework of the machine, and the lower end of the upper wall of which is flared upwardly and bears resiliently upon a guard 9| for the upper side of the main broom 3 I Figure 2. This broom guard 9| is reinforced by angles 8l s end'of the lower wall of the housing 31,:as also the lower parts of its two side walls, do not extend to the bottom of the elevator 32 but are cut away somewhat above the lower pulley 4l to allow for the passing therethrough of the ared lower ends' of elevator structure hereinafter fully describedv The elevator 32 comprises opposed pairs of longitudinaliy-extending angles 39, Figures 6, 10, and' 11, secured by gussets 49 to oppositely-directed flange ends 53 of longitudinally spaced transverse plates 53, the conveying belt running over the horizontal legs of the angles 39 and traversing the pulleys 44 and 41. Secured to the lower ends of the angles 39 are the upwardly-extended portions 52 of angular sleds having horizontal ground-engaging portions 5| which extend rearwardly, and laterally exteriorly of the main broom 3|, Figures 2, 6, 10, and 12. These sleds have rearwardly-extending web portions 52 to which the lifting chains 83 are secured. The angles 39 flare outwardly at their lower ends so as to position the sleds eXteriorly of the broom 3| and, in addition, on the curb side, a pair of channel spacers 392 are added to the outwardly dared portions -of the angles 39 to bring thesled on the curb side out farther than the sled on the opposite side of the machine since the transverse median plane of the broom 3| does not coincide with the longitudinal median plane of the machinethebroom 3| being off-center somewhat toward the curb and thus effecting a sweeping vaction near the curb.

Secured to the top of the elevator rails 39 on each side of the elevator 32 by plates 39 are blocks 292 to each of which are secured one "end of a pair of spacedfupwardly-extended bars 2li of a belt-tightening device 48, the other endsl of the bars 2|| being secured in a cross-head 2|2. A screw 2l3 has threaded engagement with the cross-head 2|2 and is swiveled upon bearings |92 supported on the upper pulley shaft 43, the other end of the screw 2|3 extending outwardly and upwardly Yfrom the cross-head 2|2 and being formed for engagement by a wrench, It is evident that, inasmuch as the pulley 44 is fixed upon the shaft 43actuation of the screw 2 I3 will cause the cross-head 2|2, and, hence, the rods 2| l, to be adjusted longitudinally of the elevator 32 and, since these rods 2| I are connected to the elevator framework, the lower pulley 4l will be moved up or down andthus provision is made for an adjustment of the spacing of the pulleys li-andlll tok permit proper tightening of the conveying belt d5 which runs upon the side angles 39. 4Secured to the diagonal frame angles |95, Figv ureY l2, by angles |85 are bearing brackets 296 and is supported by the broom-lifting channels i l5. The upper end of the upper Wall ofv the elevator housing 3l is secured to the under surface of the top wall of the machine casing 5. The lower wall of the housing 3'I is fastened at its upper end by means of a lip 38 to the top of the rear wall of the dirt reservoir |25. The lower having upwardly and forwardly extended ribs formed at p their upper ends into hub members 293 supporting the upper pulley shaft.43, The bearings |92 supporting the belt-tightening devices 49, are formed with inwardly-extended block: portions |33 positioned in end recesses 59 formed in the upper pulley 44. Resilient annular dust sealing plates |48 are positioned in thefrecesses` 59 around the shaft 43 and between the inner faces of the block portions |33 and the adjacent inner walls ofthe recesses 5l).

Control for the dump door f Provision is made for manual actuation of the bottom dump door. I of the dirt storage reservoir |25 through the lever |95, Figure 2, which is pivoted adjacent its lower end upon a pin |05 mounted in a bracket 201 secured to the mainframe member. ISG. The lever` is pivotallysecuredratits yextreme A,lower end'ito. a rod Ifl which in turn ispivotallyconnected to Vone end of an arm IIl'I .whose other end'isosecured to one Yend of a cross-shaft4 I.I I., Figures 2, 6,17, and 9, to whose other endatthefar side ofithe machine, as the machine is seen in Figure: l, is secured an arm IIS. .The arm IIE" is pivotally connected to the upper end of-adownwardly and forwardly. extending rod ,I 08 pivotallyrsecuredat its bottomend tol one end of. an .arm 109 secured at its opposite end 4to a stub. shaft H2.l Secured at itsbottom end to the stubshaft vI I2 is an arm H5 secured atits top endto one end. cfu-a crossshaft, IM. extending transversely of the machine under the dirt reservoirl25 and having a pairof rollers llobearing against the under .face of the dump door I Il. Also secured tothe opposite end of the cross-shaft II?! is the upper end of aseoond arm IIiiy mounted upon-a stub'shaft II2.. The stub .shafts II2 andv M2', are mounted l,in-a pair of depending hangers I I3 secured to the bottomV of the dirtfreservoir support. The actuation of thedump door. HT will. be readily4 understood fromv the aforegoing description-of its `Control elements, the closed condition of` .the door being shownin Figure 6, and anopen condition in Figure `'7.

The tube yI 6) surrounding the shifter-shaft 15| Figures 1 and l2, also serves-as an element in the wheel braking mechanism of. the sweeper for which purpose a lever |64 is fixed -to thetube II6!) intermediate its ends, this lever IMI-being oonnected bysuitable linkage to thefbrake pedal ITI I. Adjacent each end-of the'tube Ii a leverlIM is fixedlyfmounted, these levers Ill-having connected thereto the -usual-mechanism for transmitting the braking effort to the usualY brake drums on thefrontsupporting wheels I2.

What I claim is:

l. Ina street sweeper, a curb-broom attachment comprisingia downwardly-extended shaft, means for rotating. the shaft, a .broom secured to thelower end of the shaft, a. sleeve axiallyxed to the shaft andiin which the latter rotates, and means for lifting and'lowering the broom comprising a rotatable support, arms securedl to said support fand having free .endswhich enclose the sleeve, outwardly-extended .pinsvsecured to said sleeve, the freeends of the armsbeing formed with elongated slots intersected by saidpins, and actuating means for the support.

2.1m a street sweeper, a curb-broomk attachmentcomprising a downwardly-extended shaft, means forrotating the shaft, a `broom secured to the lower end of the shaft, a housing-mounting in whichthe shaft is rotatably mounted, asupport foi` the housing-mounting permitting automatic lateral and longitudinal adjustments, re-

spectively, thereof toponformto irregularities in the curb and roadway encountered by the broom, a spring secured adjacent one end to said support and engagingthe housing-mounting and tending to hold the latter in that position lin which the shaft is in its normal depending position, and a, U-shaped angle `whoselegs a're se,- cured to thesupport encircling the housingmounting and limiting the automatic lateral and longitudinal adjustments thereof.

3. In a street sweeper, a curb-broom attachment` comprisinga downwardly-extended shaft, means Vfor rotating the shaft, a broom secured tonie lower endy of mesma, anda` housing; mounting-in which the shaftl isjournalled Vand which hasjrnean'satlits upperend, near the upper end offsaid shaftand substantially directly above .l

ll.l In a street sweeper, a curb-.broomlattachv mentA comprising a. downwardly-extended shaft,

meansforrotating the shaft, abroom secured to` the lower end Iof the shaft, land a-housing-mount-` ing in which thel shaftis journalled and -which has at its upper end and substantially directly above the broom means-Y enabling movement/sof the lower end of the housing-mounting. in lateral and yrearward ldirectionsrelative to. thedirection of movement ofthe sweeperand automatically in conformity with projecting surface irregularities in. thel curb and roadway-encountered by the broom- Y 5.-In.astreet sweeper, a 4curb-broom attachment comprisinga housing having relatively rotatablevparts,v said housing being located at the forward-.end portion of` the-sweeper,` gear-connected shafts in the housing, a downwardly-extended shaft mounted in one of the .housing parts, a: broom secured tothe 4lower end ofthe downwardly-extended shaft, one ofA the firstmentioned .shaftsV being forwardly of the downwardly-extended. shaft'with `respect to the direction. of movement of thesweeperand thefaxis of. said. one shaftbeing substantially horizontal and transverse to. thedirectionlof movement of the sweeper, and means A.for driving the downwardly-extended shaftfrom. the first-mentioned shafts, '.the housing being automatically-rotatable aboutjsaid axisin conformity withv surface irreg-`r ularities encounteredA on .the roadway by .the

broomand said onehousing part beingautornatically rotatable about the axis of another of the first-mentioned shafts in conformity with surface irregularities encountered on the curb'by the broom.

6.-In astreet sweeper, a. curb-broom attachment `comprising a substantially horizontal shaft mounted transversely to the direction of movementof. the sweeper, asecondishaft mounted longitudinally with respect, tothe direction of movement of the'sweeper, means for drivingy the second shaft from the mst-mentioned shaft-a housing-one part of the housing being mounted for rotation about the first-mentioned shaft and a second part of vthe housing being rotatably asecured to said one housing part for rotation therewith about the erst-mentioned shaft and also for rotation independently thereof about the second 

